Lock



FIG. 1 is a front perspective view of a lock;

FIG. 2 is a front elevational view of the lock of FIG. 1;

FIG. 3 is a rear elevational view of the lock of FIG. 1;

FIG. 4 is a right side elevational view of the lock of FIG. 1;

FIG. 5 is a left side elevational view of the lock of FIG. 1;

FIG. 6 is a top plan view of the lock of FIG. 1; and,

FIG. 7 is a bottom plan view of the lock of FIG. 1.

The portions shown in broken lines are for illustrative purpose only. The shade lines adjacent to the broken lines form the boundary of the claimed design. None of the broken lines form part of the claimed design. 

CLAIM I claim the ornamental design for a lock, as shown and described. 